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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Nov-21-2017, 08:34:22 PM   #1
Dr M3an M3
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Default Designing a classy and timeless hood with functional heat reduction

Are you guys sick of my design threads yet? No? Okay, great.

As we are approaching finishing the CSL airbox. Currently the date set for the first prototypes to come out is 15th of December, we are looking ahead towards our next major project. A couple of things are in the making, such a Brembo BBK, carbon seats, radiator, an M4 GTS rear wing and other bits. More about these in later threads etc.

The current decision we are facing is - Bonnet design. As you probably have seen, we (Streamline and myself) rely a lot on you guys being apart of our creation process. This way we can integrate both of our ideas with the forum's collective wants and desires and to do things the right way from the very beginning. We can accomplish far more as a community and hive-mind collective. All in all it is a win-win. Our outlook on this is that we create a product with the assistance of the forum's experience and your collective input, and we as a community get what we want out of the products. We did so with the Bumpers (almost all of them are finished at this point) and now we need your help with the creation of a front bonnet (hood).

I want to just give a brief overview of our goals with this bonnet
:
Overall we want a very well integrated design. This is not a bonnet designed only for track-purposes, where asthetics don't matter and this is not a hood for "tuner/stance-cars" (both of which already exist for this platform).

Our goal with this hood is to create a product that is 100% functional in terms of aero, more importantly heat reduction under the hood but also subtle enough for a street car, to retain the timeless OE lines that we all love about the stock E46 M3 hood. That means, no flashy carbon fiber bits, no insanely huge visible carbon scoops etc. There are enough products out there for track cars and tuner cars to fit that need already. The idea of our bonnet is far from that. We want to keep the timeless and beautifully clean lines of the car as much as possible, while providing clear airflow away from the engine bay to enhance cooling, and to possibly increase front end downforce.

As I am sure many of you are aware, other than the many "tuner/SEMA-style" hoods that exist, really only the GTR hood seems to exist for this platform. Even the GTR hood, in our minds looks a bit too 'tuner' for our tastes and takes away from the classiness that the E46 M3's lines are known for. We DON'T want to compromise this.

All over all:
- Seamless integration
- OE Design lines kept, so that we don't detract from the beauty that this car provides
- Not too flashy or extravagent
- Definately not Tunerish, but elegant
- Fully functional at exhausting hot air out from under the hood to further reduce engine bay temps.

A vented hood when designed correctly, acts tremendously to pull the hot air that results from passing through the radiator, out of the engine bay. Any time we can reduce underhood temperatures, is a good thing. But many aftermarket hood vent solutions just do not look at home on anything other than a designated track car. We would prefer to not make another GTR hood replica. That seems to be the only main option for this car, as it is...and personally, I think only a few cars can really pull that look off without compromising the timeless look of the car by looking too "aftermarket".

At the moment we have stopped on two main variants, but any ideas would be welcome!

Inspiration #1:
The Die Weithje carbon bonnet. These are CSL pics, (since we have almost a full CSL package), the point of this hood is to work perfectly well with the CSL lines as well as the stock M3 lines.















Possible other design considerations:
Another bonnet we are looking at is the Varis Aero bonnet. It has a really interesting middle vent design (although a bit too big for our taste), but we are not fans of the side vents at all. A possible idea is to make the middle vent smaller and add the OEM E92 vents at the top, or just leave it plain.





We also had a look at the Asuka hood, and we do like the middle part sloping down. If it was vented we believe it will look nice. We would still take away the side vents too (way too "tuner" as it is). An idea might be a center vent using the F80 M4 GTS OEM vent as well - something we have though of, and similar to the ASUKA design.

Remove the side vents and possibly add the GTS M4 OE hood vent:




I also like the way this hood looks, it is clearly functional at venting out all the hot air coming off the radiator. I suspect however, that it wouldn't look good on a non-wide body, non-PTG, street car though.


Anyways, these are just some ideas. We really look forward to hearing your input on this.

It really seems damn near impossible to beat the look of the stock hood. If it's possible to retain that look, but with the addition of cooling, it would be a win-win.

All design input and considerations are welcome. Bonus points if you want to sketch something out on paper or in photoshop. I have a full professional-grade graphics design tablet setup, so it would be very easy for me to sketch out any of your ideas into photoshop.

Cheers.
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Old Tue, Nov-21-2017, 08:49:53 PM   #2
mcfreid
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Default Re: Designing a classy and timeless hood with functional heat reduction

Aesthetically, none of the hood vents are particularly pleasing. But, if they are needed, the CSL's are my favorite.
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Old Tue, Nov-21-2017, 08:56:20 PM   #3
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Default Re: Designing a classy and timeless hood with functional heat reduction

Which option improves cooling the most?

Answer that with science, then make that one. There are enough options already for parking lot heroes. It wouldn't be that difficult to buy a bunch of non-M hoods, hack in a variety of different vent shapes, and science the shit out of it for balancing aero and cooling.

A functional improvement in cooling that doesn't mess with aero is very likely to look neither aesthetically pleasing nor subtle, but would be incredibly useful for the 2% of hardcore track folk.

If you can figure out the cooling side of things, and then pull off the aesthetics side, that would be amazing. I'd sacrifice aesthetics for cooling though.
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Old Tue, Nov-21-2017, 09:01:30 PM   #4
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Default Re: Designing a classy and timeless hood with functional heat reduction

great initiative.
from previous research, it seems that a vent placed at the front 1/3rd of the bonnet (hood?) is the best spot for air extraction, since that is typically where a low pressure area is created.
any openings beyond that are a higher pressure area, which may go as far as sucking air in.
imo, for any e46 m3 bonnet, the iconic power dome must be retained, with a narrow vent being placed in front.

my AUD $0.02.

either way, keen to see what you guys come up with
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Old Tue, Nov-21-2017, 09:06:32 PM   #5
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Default Re: Designing a classy and timeless hood with functional heat reduction

Quote:
Originally Posted by mcfreid View Post
Aesthetically, none of the hood vents are particularly pleasing. But, if they are needed, the CSL's are my favorite.
The CSL uses the same hood as a stock E46 M3. Maybe you are referring to the GTR vented hood? Which is what you see 99.99% of the time when it comes to other hoods than stock on this car.

Quote:
Originally Posted by Bimmerman325i View Post
Which option improves cooling the most?

Answer that with science, then make that one. There are enough options already for parking lot heroes. It wouldn't be that difficult to buy a bunch of non-M hoods, hack in a variety of different vent shapes, and science the shit out of it for balancing aero and cooling.

A functional improvement in cooling that doesn't mess with aero is very likely to look neither aesthetically pleasing nor subtle, but would be incredibly useful for the 2% of hardcore track folk.

If you can figure out the cooling side of things, and then pull off the aesthetics side, that would be amazing. I'd sacrifice aesthetics for cooling though.
Totally understand what you mean. "Sciencing the shit out of it" is EXACTLY my cup of tea and method to my madness. I am all about "form follows function". However, our goal is to make something functional but still subtle enough not to ruin the beautiful look of this car. There are plenty of options for 'Track Only" cars (IE: the GTR's two different vented hood configurations designed by BMW AG Motorsports)....but for a street car, those hoods really detract from how beautiful this car is in street form.
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Old Tue, Nov-21-2017, 09:18:36 PM   #6
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Default Re: Designing a classy and timeless hood with functional heat reduction

It's ALL about fitment. It can be the most gorgeous hood ever desinged, but if it doesn't look like it came on the car from the factory, it will be an eyesore, much more than a diffuser or even a trunk.
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Old Tue, Nov-21-2017, 09:21:55 PM   #7
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Default Re: Designing a classy and timeless hood with functional heat reduction

Sub'd to see what you guys come up with.

I am already locked into my hood (Flossman), but I would suggest some sort of water diverter.
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Old Tue, Nov-21-2017, 09:25:23 PM   #8
Brian N
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Default Re: Designing a classy and timeless hood with functional heat reduction

Love the design philosophy and direction this is going! This is one tough nut to crack IMO.

It would have to be pretty compelling for me to want to switch from the stock aluminum. I liked my Vorsetiner hood on my sedan but it also has its downsides. Gaps were good but not perfect like it can be seen in that DW hood in the first pic. Gaps are a little big. That and it being easier to chip, but these days a full clear bra on the hood could help with that issue. Lastly over time it started to sag/warp a tad and I had to attach rubber spacers to make it fit correctly again.

Design wise I think that Jun’s car came the closest to the clean and OE look. Though to me still doesn’t look quite right for the generation of our car. That DW hood isn’t too bad either. I would probably eliminate the outer set of vents and only keep the inners. The vents seem to disappear at certain angles but then also catch the sun and stick out sorely in others. The Varis hood is just all around hideous to me. I would toss that. Then the Asuka center vent idea isn’t a bad one. Especially keeping the stock dome shape and size intact. If it were me this is probably what I would think is the best option. However not sure how much cooling can be achieved from such a small vent. Then if it is worth the trade off for the slightly off putting hood lines.

Quote:
Originally Posted by TboneM3 View Post
It's ALL about fitment. It can be the most gorgeous hood ever desinged, but if it doesn't look like it came on the car from the factory, it will be an eyesore, much more than a diffuser or even a trunk.
Yes 1000 times yes.
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Old Tue, Nov-21-2017, 09:42:45 PM   #9
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Default Re: Designing a classy and timeless hood with functional heat reduction

Honestly a perfect hood for me would be the asuka with a standard center/powerdome.

Or the die weithje without the outer two vents?
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Old Tue, Nov-21-2017, 09:45:54 PM   #10
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Default Re: Designing a classy and timeless hood with functional heat reduction

Please include a rain cover as an optional piece for whatever design is chosen. Would suck to get caught in the rain from a long trip.
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Discussing Designing a classy and timeless hood with functional heat reduction in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)